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Kaneko, Masashi; Sasaki, Yuji; Wada, Eriko*; Nakase, Masahiko*; Takeshita, Kenji*
Chemistry Letters, 50(10), p.1765 - 1769, 2021/10
Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)Density functional theory calculation is applied to predict the stability constants for Eu
and Am complexes in aqueous solution for molecular modelling of novel separation agents for minor actinides over lanthanides. Logarithm of experimental stability constants correlates with calculated complex formation enthalpies with high reproducibility (R
0.98). Prediction of stability constants of novel chelates is demonstrated and indicates a potential availability of the derivatives of diethylenetriaminepentaacetic acid type chelate in acidic condition and enhancement of Am selectivity over Eu.
Nagai, Ryoji; Hajima, Ryoichi; Sawamura, Masaru; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Nishitani, Tomohiro; Minehara, Eisuke
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.656 - 658, 2004/08
no abstracts in English
Nagai, Ryoji; Sawamura, Masaru; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Nishitani, Tomohiro; Minehara, Eisuke
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.293 - 295, 2004/08
no abstracts in English
Sekita, Tsutomu; Tachibana, Haruo; Matsuura, Kenichi; Yamaguchi, Takenori
JAERI-Data/Code 2003-017, 106 Pages, 2003/12
JAERI-Data-Code-2003-017.pdf:5.32MB
The meteorological observation data at Tokai site were analyzed statistically based on a "Guideline of meteorological statistics for the safety analysis of nuclear power reactor" (Nuclear Safety Commission on January 28,1982; revised on March 29, 2001). This report shows the meteorological analysis of wind direction, wind velocity and atmospheric stability etc. to assess the public dose around the Tokai site caused by the released gaseous radioactivity. The statistical period of meteorological data is every 5 years from 1981 to 1995.
Nagai, Ryoji; Sawamura, Masaru; Kikuzawa, Nobuhiro; Hajima, Ryoichi; Nishimori, Nobuyuki; Minehara, Eisuke
Dai-14-Kai Kasokuki Kagaku Kenkyu Happyokai Hokokushu, p.362 - 364, 2003/00
no abstracts in English
Moriyama, Hirotake*
JNC TJ8400 2000-050, 47 Pages, 2000/03
JNC-TJ8400-2000-050.pdf:1.49MB
In support of the safety assessment of geologic disposal of high levcl radioactive wastes, the solubility of transuranium elements was studied. The solubility of PuO
xHO was measured undcr a reducing condition, and the solubility product K
and the stability constant 
of Pu(OH) were obtained. The obtained K value was found to be much smaller than that predicted by Rai et al. from its dependence on ionic radius. Also, the solubility of PuO
3 xHO was measured under an oxidizing condition and the solubility product K was obtained. In the analysis of hydrolysis constants of actinide ions, it was found that the systematic trend of the hydrolysis constants was well explained by the hard sphere model considering the effective charges of actinide ions.
Tochiyama, Osamu*
JNC TJ8400 2000-044, 53 Pages, 2000/02
JNC-TJ8400-2000-044.pdf:1.41MB
To estimate the polyelectrolyte effect and the effect of the heterogeneous composition of humic acids, the complex formation constants of Eu(III) and Ca(II) with Aldrich humic acid and polyacrylic acid were obtained, for Eu(10
to 10
M) by solvent extraction with TTA and TBP in xylene, for Ca (10
M) with TTA and TOPO in cyclohexane and for Ca(10
M) by using ion-selective electrode. By defining the apparent formation as 
= [MR
]/([M][R]), where [R] denotes the concentration of dissociated functional group, [M] and [MR] denote the concentration of free and bound metal ion and pcH is defined as-log[H], the values of log have been obtained at pcH 4.8 - 5.5 in 0.1 - 1.0M NaClO and NaCl. Log of Eu-humate varied from 5.0 to 9.3 and that of Ca-humate from 2.0 to 3.4..For both humate and polyacrylate, log increased with pcH or with the degree of dissociation. The increase in the ionic strength O.1 to 1.0 M decreased the log, the decrease in log of Eu(III)-humate is 1.6, that of Eu(III), polyacrylate 0.7, that of Ca(II)-humate 1.9 and that of Ca(II)-polyacrylate 1.2. While the increase in the metal ion produced no effect on log of polyacrylate, log of humate decreased. Depending on the concentration of Eu(III), the coexistence of Ca(II) reduced log of humate by 0 to 0.8. The dependence of log of humate on the metal ion concentration suggests the coexistence of strong and weak binding sites in the hmnic acid.
and AnO
Species in Geologic EnvironmentsChoppin, G. R.*; Bronikowski, M.*; Chen, J.*; Byegard, J.*; Rai, D.*; Yui, Mikazu
JNC TN8400 99-012, 155 Pages, 1999/01
This report provides thermodynamic data for predicting concentrations of pentavalent and hexavalent actinide species (AnO
and AnO
) in geologic environments, and contributes to an integration of the JNC chemical thermodynamic database, JNC-TDB (previously PNC-TDB), for the performance analysis of geological isolation system for high-level radioactive wastes. Thermodynamic data for the formation of complexes or compounds with hydroxide, chloride, fluoride, carbonate, nitrate, sulfate and phosphate are discussed in this report. The estimation of the stability constants by use of the Born equation is included. The Pitzer parameters for AnO and AnO, redox potentials and equilibrium constants of redox reactions for actinides are also included.
Lothenbach, B.*; Ochs, M.*; Wanner, H.*; Yui, Mikazu
JNC TN8400 99-011, 340 Pages, 1999/01
This report provides thermodynamic data for predicting concentrations of palladium Pd, lead Pb, tin Sn, antimony Sb, niobium Nb and bismuth Bi in geologic environments, and contributes to an integration of the JNC chemical thermodynamic database, JNC-TDB (previously PNC-TDB), for the performance analysis of geological isolation system of high-level radioactive wastes. Besides treating hydrolysis in detail, this report focuses on the formation of complexes or compounds with chloride, fluoride, carbonate, nitrate, sulfate and phosphate. Other important inorganic ligands (sulfide for lead and antimony, ammonia for palladium) are also included. In this study, the specific ion interaction theory (SIT) approach is used to extrapolate thermodynamic constants to zero ionic strength at 25
C.
; Yamazawa, Hiromi
Journal of Nuclear Science and Technology, 34(8), p.835 - 846, 1997/08
Times Cited Count：2 Percentile：23.01(Nuclear Science & Technology)no abstracts in English
Kamiya, Tomihiro; Suda, Tamotsu*; Tanaka, Ryuichi
Nuclear Instruments and Methods in Physics Research B, 118(1-4), p.423 - 425, 1996/09
Times Cited Count：18 Percentile：80.24(Instruments & Instrumentation)no abstracts in English
; ; ; ; Kano, Yutaka
PNC TN8420 96-017, 50 Pages, 1996/08
The meteorological observation has been performed since 1955 in PNC Tokai-works. After 1974, this observation came to measure on the top of the meteorological tower (100m above sea level) for the environmental assessment of a radioactive waste with the atmospheric discharge from the reprocessing plant. This report presents an atmospheric phenomenon statistic result and an examination about a characteristic of the atmosphere diffusion based on the data from 1977 to 1995. Characteristics of the result are as follows; (1)It was confirmed that the maximum air concentration point that was calculated based on the discharge amount from reprocessing plant and atmospheric phenomenon statistic of each year appears at near point in the safety assessment of 1977. (2)In some case, a maximum concentration point has appeared at about 800m in the west-southwest direction owing to the deference of appearance frequency of the atmospheric stability, etc. Normally it appears at about 2,000m point in south-west direction. Still, as reference materials, atmospheric phenomenon statistics result and relative concentration were mentioned.
Kamiya, Tomihiro; Suda, Tamotsu; Sakai, Takuro; Hamano, Tsuyoshi*
Dai-8-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, P. 73, 1995/07
no abstracts in English
Narita, Osamu; Muto, Shigeo; ; Kano, Yutaka;
PNC TN8420 94-017, 91 Pages, 1994/06
We enforce weather observation at PNC Tokai Works from 1960's. We have been equipping with weather observation devices and tower from around 1974, for the purpose of environment influence evaluation resulted from radioactive waste which is discharged the atmosphere uses from reprocessing plant. Weather data observed before now are utilize for several kinds of classification way of atmospheric stability. So we compared them with a tendency of frequency distribution of atmospheric stability using each classification way. A tendency of frequency distribution of way using lapse late alone are different from one of way using weather regulatory guide classification. But a similar tendency was looked at frequency distribution of way using weather regulatory guide classification and one of way using wind speed combined with lapse late. we analized and compared with each classification way of atmospheric stability on the basis of a large quantity data observed for 10 years and we grasped a characteristic of classification way and observation site. The lapse late observation that is observed for the purpose of reference to diffusion parameter estimate and other weather observations with the view of investigation of atmospheric stability accomplished their objects. And we conclude that thier weather observation wound up for the resent.
Nakamura, Yoshiteru; Yokota, Wataru; Okumura, Susumu; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Ishibori, Ikuo; Arakawa, Kazuo; Hoshika, Keizo*; *
JAERI-M 94-054, 61 Pages, 1994/03
no abstracts in English
Kamiya, Tomihiro; Suda, Tamotsu*; Ishii, Yasuyuki; Saito, Yuichi; Tanaka, Ryuichi
BEAMS 1994: Dai-5-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu Koen Rombunshu, p.15 - 18, 1994/00
no abstracts in English
